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MPL 20x3x2 / N38 - lamellar magnet

lamellar magnet

Catalog no 020130

GTIN/EAN: 5906301811367

5.00

length

20 mm [±0,1 mm]

Width

3 mm [±0,1 mm]

Height

2 mm [±0,1 mm]

Weight

0.9 g

Magnetization Direction

↑ axial

Load capacity

2.33 kg / 22.90 N

Magnetic Induction

370.68 mT / 3707 Gs

Coating

[NiCuNi] Nickel

0.394 with VAT / pcs + price for transport

0.320 ZŁ net + 23% VAT / pcs

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Product card - MPL 20x3x2 / N38 - lamellar magnet

Specification / characteristics - MPL 20x3x2 / N38 - lamellar magnet

properties
properties values
Cat. no. 020130
GTIN/EAN 5906301811367
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin Poland / China / Germany
Customs code 85059029
length 20 mm [±0,1 mm]
Width 3 mm [±0,1 mm]
Height 2 mm [±0,1 mm]
Weight 0.9 g
Magnetization Direction ↑ axial
Load capacity ~ ? 2.33 kg / 22.90 N
Magnetic Induction ~ ? 370.68 mT / 3707 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 20x3x2 / N38 - lamellar magnet
properties values units
remenance Br [min. - max.] ? 12.2-12.6 kGs
remenance Br [min. - max.] ? 1220-1260 mT
coercivity bHc ? 10.8-11.5 kOe
coercivity bHc ? 860-915 kA/m
actual internal force iHc ≥ 12 kOe
actual internal force iHc ≥ 955 kA/m
energy density [min. - max.] ? 36-38 BH max MGOe
energy density [min. - max.] ? 287-303 BH max KJ/m
max. temperature ? ≤ 80 °C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C
properties values units
Vickers hardness ≥550 Hv
Density ≥7.4 g/cm3
Curie Temperature TC 312 - 380 °C
Curie Temperature TF 593 - 716 °F
Specific resistance 150 μΩ⋅cm
Bending strength 250 MPa
Compressive strength 1000~1100 MPa
Thermal expansion parallel (∥) to orientation (M) (3-4) x 10-6 °C-1
Thermal expansion perpendicular (⊥) to orientation (M) -(1-3) x 10-6 °C-1
Young's modulus 1.7 x 104 kg/mm²

Technical analysis of the assembly - data

These data represent the outcome of a physical simulation. Values were calculated on models for the material Nd2Fe14B. Operational performance might slightly differ. Use these data as a reference point during assembly planning.

Table 1: Static force (force vs gap) - characteristics
MPL 20x3x2 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3700 Gs
370.0 mT
2.33 kg / 5.14 pounds
2330.0 g / 22.9 N
warning
1 mm 2103 Gs
210.3 mT
0.75 kg / 1.66 pounds
752.3 g / 7.4 N
low risk
2 mm 1172 Gs
117.2 mT
0.23 kg / 0.52 pounds
233.7 g / 2.3 N
low risk
3 mm 721 Gs
72.1 mT
0.09 kg / 0.20 pounds
88.5 g / 0.9 N
low risk
5 mm 345 Gs
34.5 mT
0.02 kg / 0.04 pounds
20.3 g / 0.2 N
low risk
10 mm 101 Gs
10.1 mT
0.00 kg / 0.00 pounds
1.7 g / 0.0 N
low risk
15 mm 42 Gs
4.2 mT
0.00 kg / 0.00 pounds
0.3 g / 0.0 N
low risk
20 mm 21 Gs
2.1 mT
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
low risk
30 mm 7 Gs
0.7 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
low risk
50 mm 2 Gs
0.2 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
low risk

Table 2: Vertical hold (wall)
MPL 20x3x2 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.47 kg / 1.03 pounds
466.0 g / 4.6 N
1 mm Stal (~0.2) 0.15 kg / 0.33 pounds
150.0 g / 1.5 N
2 mm Stal (~0.2) 0.05 kg / 0.10 pounds
46.0 g / 0.5 N
3 mm Stal (~0.2) 0.02 kg / 0.04 pounds
18.0 g / 0.2 N
5 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N
10 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N

Table 3: Wall mounting (shearing) - vertical pull
MPL 20x3x2 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.70 kg / 1.54 pounds
699.0 g / 6.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.47 kg / 1.03 pounds
466.0 g / 4.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.23 kg / 0.51 pounds
233.0 g / 2.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.17 kg / 2.57 pounds
1165.0 g / 11.4 N

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 20x3x2 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.23 kg / 0.51 pounds
233.0 g / 2.3 N
1 mm
25%
0.58 kg / 1.28 pounds
582.5 g / 5.7 N
2 mm
50%
1.17 kg / 2.57 pounds
1165.0 g / 11.4 N
3 mm
75%
1.75 kg / 3.85 pounds
1747.5 g / 17.1 N
5 mm
100%
2.33 kg / 5.14 pounds
2330.0 g / 22.9 N
10 mm
100%
2.33 kg / 5.14 pounds
2330.0 g / 22.9 N
11 mm
100%
2.33 kg / 5.14 pounds
2330.0 g / 22.9 N
12 mm
100%
2.33 kg / 5.14 pounds
2330.0 g / 22.9 N

Table 5: Thermal resistance (material behavior) - thermal limit
MPL 20x3x2 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 2.33 kg / 5.14 pounds
2330.0 g / 22.9 N
OK
40 °C -2.2% 2.28 kg / 5.02 pounds
2278.7 g / 22.4 N
OK
60 °C -4.4% 2.23 kg / 4.91 pounds
2227.5 g / 21.9 N
80 °C -6.6% 2.18 kg / 4.80 pounds
2176.2 g / 21.3 N
100 °C -28.8% 1.66 kg / 3.66 pounds
1659.0 g / 16.3 N

Table 6: Two magnets (repulsion) - field range
MPL 20x3x2 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 5.06 kg / 11.17 pounds
4 866 Gs
0.76 kg / 1.67 pounds
760 g / 7.5 N
N/A
1 mm 3.01 kg / 6.64 pounds
5 705 Gs
0.45 kg / 1.00 pounds
452 g / 4.4 N
2.71 kg / 5.97 pounds
~0 Gs
2 mm 1.64 kg / 3.61 pounds
4 205 Gs
0.25 kg / 0.54 pounds
245 g / 2.4 N
1.47 kg / 3.24 pounds
~0 Gs
3 mm 0.89 kg / 1.97 pounds
3 106 Gs
0.13 kg / 0.29 pounds
134 g / 1.3 N
0.80 kg / 1.77 pounds
~0 Gs
5 mm 0.31 kg / 0.67 pounds
1 816 Gs
0.05 kg / 0.10 pounds
46 g / 0.4 N
0.27 kg / 0.61 pounds
~0 Gs
10 mm 0.04 kg / 0.10 pounds
690 Gs
0.01 kg / 0.01 pounds
7 g / 0.1 N
0.04 kg / 0.09 pounds
~0 Gs
20 mm 0.00 kg / 0.01 pounds
202 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
50 mm 0.00 kg / 0.00 pounds
24 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.00 pounds
14 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
9 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
6 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
5 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
3 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs

Table 7: Safety (HSE) (implants) - precautionary measures
MPL 20x3x2 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 3.5 cm
Hearing aid 10 Gs (1.0 mT) 3.0 cm
Timepiece 20 Gs (2.0 mT) 2.5 cm
Mobile device 40 Gs (4.0 mT) 2.0 cm
Remote 50 Gs (5.0 mT) 1.5 cm
Payment card 400 Gs (40.0 mT) 0.5 cm
HDD hard drive 600 Gs (60.0 mT) 0.5 cm

Table 8: Collisions (cracking risk) - collision effects
MPL 20x3x2 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 51.34 km/h
(14.26 m/s)
0.09 J
30 mm 88.88 km/h
(24.69 m/s)
0.27 J
50 mm 114.74 km/h
(31.87 m/s)
0.46 J
100 mm 162.27 km/h
(45.08 m/s)
0.91 J

Table 9: Surface protection spec
MPL 20x3x2 / N38

Technical parameter Value / Description
Coating type [NiCuNi] Nickel
Layer structure Nickel - Copper - Nickel
Layer thickness 10-20 µm
Salt spray test (SST) ? 24 h
Recommended environment Indoors only (dry)

Table 10: Electrical data (Flux)
MPL 20x3x2 / N38

Parameter Value SI Unit / Description
Magnetic Flux 1 748 Mx 17.5 µWb
Pc Coefficient 0.32 Low (Flat)

Table 11: Hydrostatics and buoyancy
MPL 20x3x2 / N38

Environment Effective steel pull Effect
Air (land) 2.33 kg Standard
Water (riverbed) 2.67 kg
(+0.34 kg buoyancy gain)
+14.5%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Shear force

*Warning: On a vertical wall, the magnet retains merely ~20% of its perpendicular strength.

2. Plate thickness effect

*Thin steel (e.g. computer case) drastically weakens the holding force.

3. Temperature resistance

*For standard magnets, the critical limit is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.32

The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. The solid red line represents the demagnetization curve (material potential), while the dashed blue line is the load line based on the magnet's geometry. The Pc (Permeance Coefficient), also known as the load line slope, is a dimensionless value that describes the relationship between the magnet's shape and its magnetic stability. The intersection of these two lines (the black dot) is the operating point — it determines the actual magnetic flux density generated by the magnet in this specific configuration. A higher Pc value means the magnet is more 'slender' (tall relative to its area), resulting in a higher operating point and better resistance to irreversible demagnetization caused by external fields or temperature. A value of 0.42 is relatively low (typical for flat magnets), meaning the operating point is closer to the 'knee' of the curve — caution is advised when operating at temperatures near the maximum limit to avoid strength loss.

Technical specification and ecology
Chemical composition
iron (Fe) 64% – 68%
neodymium (Nd) 29% – 32%
boron (B) 1.1% – 1.2%
dysprosium (Dy) 0.5% – 2.0%
coating (Ni-Cu-Ni) < 0.05%
Environmental data
recyclability (EoL) 100%
recycled raw materials ~10% (pre-cons)
carbon footprint low / zredukowany
waste code (EWC) 16 02 16
Safety card (GPSR)
responsible entity
Dhit sp. z o.o.
ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki
tel: +48 22 499 98 98 | e-mail: bok@dhit.pl
batch number/type
id: 020130-2026
Quick Unit Converter
Pulling force

Field Strength

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Model MPL 20x3x2 / N38 features a low profile and professional pulling force, making it a perfect solution for building separators and machines. As a magnetic bar with high power (approx. 2.33 kg), this product is available immediately from our warehouse in Poland. Additionally, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, giving it an aesthetic appearance.
Separating block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 20x3x2 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend extreme caution, because after separation, the magnets may want to violently snap back together, which threatens pinching the skin. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 20x3x2 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. They work great as fasteners under tiles, wood, or glass. Customers often choose this model for hanging tools on strips and for advanced DIY and modeling projects, where precision and power count.
For mounting flat magnets MPL 20x3x2 / N38, we recommend utilizing two-component adhesives (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. Double-sided tape cushions vibrations, which is an advantage when mounting in moving elements. Remember to roughen and wash the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
The magnetic axis runs through the shortest dimension, which is typical for gripper magnets. In practice, this means that this magnet has the greatest attraction force on its main planes (20x3 mm), which is ideal for flat mounting. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
The presented product is a neodymium magnet with precisely defined parameters: 20 mm (length), 3 mm (width), and 2 mm (thickness). It is a magnetic block with dimensions 20x3x2 mm and a self-weight of 0.9 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Strengths as well as weaknesses of rare earth magnets.

Strengths

Besides their durability, neodymium magnets are valued for these benefits:
  • Their power is maintained, and after approximately ten years it decreases only by ~1% (according to research),
  • Magnets very well defend themselves against loss of magnetization caused by ambient magnetic noise,
  • In other words, due to the shiny surface of gold, the element looks attractive,
  • Magnetic induction on the top side of the magnet is maximum,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures approaching 230°C and above...
  • Thanks to the option of free molding and adaptation to individualized needs, magnetic components can be produced in a wide range of forms and dimensions, which makes them more universal,
  • Wide application in electronics industry – they find application in mass storage devices, motor assemblies, precision medical tools, as well as technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which enables their usage in small systems

Cons

Disadvantages of NdFeB magnets:
  • They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only protects the magnet but also improves its resistance to damage
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Due to limitations in creating threads and complex forms in magnets, we recommend using cover - magnetic mount.
  • Possible danger to health – tiny shards of magnets can be dangerous, in case of ingestion, which gains importance in the context of child health protection. It is also worth noting that tiny parts of these products are able to disrupt the diagnostic process medical after entering the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Lifting parameters

Maximum holding power of the magnet – what it depends on?

The declared magnet strength concerns the maximum value, obtained under laboratory conditions, meaning:
  • on a plate made of structural steel, perfectly concentrating the magnetic field
  • with a cross-section no less than 10 mm
  • characterized by smoothness
  • with total lack of distance (without coatings)
  • for force applied at a right angle (in the magnet axis)
  • at conditions approx. 20°C

Magnet lifting force in use – key factors

Holding efficiency impacted by specific conditions, such as (from priority):
  • Clearance – the presence of any layer (rust, dirt, gap) interrupts the magnetic circuit, which reduces power steeply (even by 50% at 0.5 mm).
  • Force direction – note that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the maximum value.
  • Element thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Metal type – different alloys attracts identically. Alloy additives weaken the attraction effect.
  • Surface structure – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
  • Heat – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).

Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, however under parallel forces the lifting capacity is smaller. In addition, even a minimal clearance between the magnet’s surface and the plate lowers the holding force.

Warnings
Finger safety

Pinching hazard: The attraction force is so immense that it can cause blood blisters, crushing, and broken bones. Use thick gloves.

Maximum temperature

Do not overheat. NdFeB magnets are susceptible to heat. If you need resistance above 80°C, inquire about HT versions (H, SH, UH).

Adults only

Neodymium magnets are not toys. Swallowing multiple magnets may result in them pinching intestinal walls, which constitutes a direct threat to life and necessitates immediate surgery.

Health Danger

Patients with a pacemaker have to keep an absolute distance from magnets. The magnetic field can stop the functioning of the implant.

Magnetic interference

A powerful magnetic field interferes with the operation of magnetometers in phones and GPS navigation. Keep magnets near a device to prevent damaging the sensors.

Protect data

Data protection: Neodymium magnets can ruin data carriers and sensitive devices (heart implants, hearing aids, mechanical watches).

Handling rules

Before starting, check safety instructions. Uncontrolled attraction can break the magnet or injure your hand. Think ahead.

Fire risk

Mechanical processing of neodymium magnets poses a fire risk. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Skin irritation risks

A percentage of the population experience a hypersensitivity to nickel, which is the typical protective layer for NdFeB magnets. Frequent touching may cause dermatitis. We suggest wear protective gloves.

Magnet fragility

Neodymium magnets are ceramic materials, which means they are very brittle. Clashing of two magnets leads to them breaking into shards.

Warning! Need more info? Check our post: Are neodymium magnets dangerous?